What can I do if key tones (DTMF) are not transmitted?
Fix DTMF problems in sipgate: how to configure key tone transmission on SNOM, Yealink, and other VoIP devices.
Dual Tone Multifrequency (DTMF) refers to the transmission of key tones over the telephone network to the receiving side.
Default setting for all devices
Open the configuration menu of your phone/VoIP adapter/VoIP app and select in the section DTMF and via RTP (RFC2833)
In the web configuration menu Identity 1 (sipgate) and SIP as well as the option DTMF via SIP INFO to execute it.
Additionally, in the tab RTP the option RTP encryption to execute it and the Long SDP response to on be set.
In the web configuration menu, go to Settings → Telephony → Further VoIP settings in the upper section Transmission settings for DTMF transmission to RFC2833 set.
If you are working with Asterisk, change in the file sip.conf for the sipgate peer the line dtmfmode from Info to rfc2833.
Open the configuration menu of your router and go to Special settings and VoIP. Set the option there CODEC, RTP and DTMF to DTMF (Dual Tone Multi Frequency) to Out-of-band; payload type: 101.
In the menu, go to settings and Account settings and select the corresponding SIP account there. Scroll down to the codec settings and click on DTMF Now select the option RFC2833 and save the entry.
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